Sierra Wireless 20070914 7: IP Manager

Rev 3.0B Feb.08 70

7: IP Manager

•Understanding DNS IfyouhaveafleetofSierraWirelessAirLinkmodemsoreven

ifyouonlyhaveone,itcanbedifficulttokeeptrackofthe

currentIPaddresses,especiallyiftheaddressesaren’tstatic

butchangeeverytimethemodemsconnecttoProvider.Ifyou

needtoconnecttoamodem,orthedevicebehindit,itisso

mucheasierwhenyouhaveadomainname

(car54.mydomain.com,whereareyou?).

Reasons to contact the modem and/or the connected

device:

•Requestingalocationupdatefromadeliverytruck.

•Contactingasurveillancecameratodownloadlogsor

surveyaspecificarea.

•Anoilderekthatneedstobetriggeredtobeginpumping.

•Sendingtexttobedisplayedbyaroadsign.

•Updatingthesongstobeplayedonajukebox.

•Updatingadvertisementstobedisplayedinacab.

•Remoteaccesstoacomputer,aPLC,anRTU,orother

system.

•Monitoringandtroubleshootingthestatusofthemodem

itselfwithoutneedingtobringitinorgoouttoit.

AdynamicIPaddressissuitableformanyInternetactivities

suchaswebbrowsing,lookingupdataonanothercomputer

system,dataonlybeingsentout,ordataonlybeingreceived

afteraninitialrequest(alsocalledMobileOriginated).

However,ifyouneedtocontactRavendirectly,adevice

connectedtothemodem,orahostsystemusingyourRaven

(alsocalledMobileTermi na ted ),adynamicIPwon’tgiveyoua

reliableaddresstocontact(sinceitmayhavechangedsincethe

lasttimeitwasassigned).

DomainnamesareoftenonlyconnectedtostaticIPaddresses

becauseofthewaymostdomainname(DNS)serversareset‐

up.DynamicDNSserversrequirenotificationofIPAddress

changessotheycanupdatetheirDNSrecordsandlinka

dynamicIPaddresstothecorrectname.